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根据橡胶沥青结合料的动态剪切流变试验变异性大的缺点,采用不同平行板间隙和不同目数的胶粉,研究不同温度和频率扫描下,橡胶沥青的复数剪切模量、相位角和相分离温度。结果表明:采用10%最大复数剪切模量作为橡胶沥青结合料动态剪切流变试验的应变控制条件能保证其结果符合线黏弹性假设,采用2 mm平行板间隙能获得试验结果的可重复性;随着橡胶粉粒径的减小,高温条件下橡胶沥青结合料Han曲线斜率逐渐增大,100目细度橡胶粉改性沥青出现相分离温度为70℃,而40,60目及80目胶粉制备的改性沥青相分离温度为60℃;不同温度-频率谱条件下的存储模量曲线出现平台区的温度与Han曲线所反映的相分离温度一致。
According to the large variability of dynamic shear rheological test of rubber asphalt binder, the rubber powder with different parallel plates clearance and different mesh numbers is used to study the complex shear modulus and phase angle of rubber asphalt under different temperature and frequency sweeps And phase separation temperature. The results show that the 10% maximum complex shear modulus can be used as the strain control criterion in the dynamic shear rheological test of rubber-asphalt mixtures to ensure that the results meet the linear viscoelasticity assumption. The experimental results are reproducible using 2 mm parallel plate gap The slope of the Han curve of rubber asphalt binder increased with the decrease of particle size of rubber powder. The phase separation temperature of rubber powder modified asphalt with 100 mesh fineness was 70 ℃, while that of 40, 60 mesh and 80 The separation temperature of modified bitumen was 60 ℃. The storage modulus curve under different temperature-frequency spectra showed that the temperature of platform zone was consistent with the phase separation temperature reflected by Han curve.